I noticed little things, a dip of the head, a twitch in the shoulder.
我注意到一些小动作，脑袋向下的一沉、肩膀的一抽动。
《柯林斯英汉双解大词典》
2
He gave a dip of his head.
他点了点头。
《牛津词典》
3
Based on the chunkysalsa rule from TVTropes: Any situation that wouldreduce a character’s head to theconsistency of chunky salsa dip is fatal, regardless of other rules.